Alveus Kombino 30FS Flushmount or Topmount kitchen sink. Mounting Type Flushmount or Topmount Cabinet Size 450mm Radius 15mm Cut-out Size 428 x 428mm for Topmounting Material Stainless Steel Finish Polished Steel External Dimensions 440 x 440 x 195mm Internal Dimensions 400 x 400 x 195mm Stainless Steel Grade SS 304 Available accessories include a rectangular perforated colander and chopping boards of either black glass or walnut and priced between €50 to €90. More information is available on their web pages. It is recommended that you use the sink for templating for your desired mounting.